Use a direct include of strings headers in chrome/browser/a*-c*/.

chrome/browser/component_updater/pnacl/pnacl_component_installer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/logging.h"
 #include "base/path_service.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "base/win/windows_version.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 405 matching lines @@
   // No need to check the commandline flags again here.
   // We could only have gotten here after RegisterPnaclComponent
   // found --enable-pnacl, since that is where we create the profile_observer_,
   // which in turn calls ReRegisterPnacl.
   DCHECK(per_user_);
   // Figure out profile information, before proceeding to look for files.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&GetProfileInformation, this));
 }